Well, I feel strongly there was someone in that car other than MF and HB, however, I don't think it was a new "lover" unless they planned to off CG next and take over his house. However, that may have been a bit much even for MF. She couldn't even get rid of HB's body. That still baffles me. Bringing the corpse home. What was she thinking??
I sense some are directing their attention to HB's former bf, but I would hope LE have scrutinized his digital footprint by now to see if there is even the slightest link to MF. LE are likely aware of him and surely are not leaving any stone unturned to solve this bizarre murder. It would be interesting though to hear him speak on how he perceived MF during his time with HB. Not sleuthing him, as he is not a POI.